Type writer escapement



G. F. ROSE. TYPE W'RITER ESCAPEMENT.

APPUCAHON FILED NOV. 7. 1912.

1,195,504. Patented Aug. 22, 1916.

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G. F. ROSE.

TYPE WRITER ESCAPEMENT.

APPLICATION HLED NOV-7,1912.

1 1 95,504. Patented Ami. 19w.

T a M GEORGE F. ROSE, OF NEW YORK, N. Y.-

TYPE-VIRITER ESCAPEMENT.

Specification of Letters Patent.

Patented Aug. 22, 19;

(Application filed November 7, 1912. Serial No. 729,980.

To all whom it may concern. 7

Be it known that I, GEORGE F. Rose, a citizen of the United States, residing in the city of New York, borough of Manhattan, county and State of New York, have invented a certain new and useful Type-\Vriter Escapement, of which the following is a specification.

This invention is an escapement for typewriters, the object being to produce a simple and eflicient means for controlling the stepby-step movement of the platen carriage, the latter being impelled in one direction by aspring.

The salient feature of the device is a toothed escapement wheel capable of Vibratory and rotary movement.

In a practical embodiment of the invention, the escapement wheel is fitted on'a, square or polygonal part of a shaft, the lattor being journaled in a stationary part of the typewriter and said shaft being provided with a gear which meshes with a rack on the platen carriage. lVith the vibratory escapeinent wheel cooperate two dogs, one fixed and the other movable, said dogs being in the path of the teetlr on said wheel. The fixed dog is on a bracket or other device positioned on the stationary part of the machine so as to engage with a tooth of the escapement wheel when the latter occupies a lowered position to hold the carriage at rest. The other dog is on a vibratory member which is operated to lift the escapement wheel free from the fixed dog, after which disengagement the carriage spring impels the carrage the distance of one step and the escapeznent wheel turns for a. distance of one tooth, the intermittent motion of the escapeinent wheel being controlled by the tooth coming into contact with the dog on the vibratory member. Said member is preferably in the form of a bell crank and is operated from the universal bar of the typewriter, said member and the dog thereon serving in a twofold capacity, first, as means for giving the vibratory sidewisc movement to the cscapement wheel and, second, as a stop to arrest the rotation of the escapemcut wheel under the energy of the carriage spring. 7

Other features of the invention, and the advantages thereof, will appear in the course of the following detailed description taken in connection with the itlrawings.

In the accompanying drawings, I have illustrated one practical embodiment of the nvention, but the construction shown therein is to be understood as illustrative, only, and not as defining the limits of theinvention.

Figure 1 is a view in front elevation, partly in section, of a typewriter machine embodying the escapement mechanism of the present invention, the plane of the sec-- tion being indicated by the dotted line 1 1- of Fig. 2, and certain parts, such as the key action, being omitted. Fig. 2 is a. vertical cross section on the line 22 of Fig-*1. Fig. 3 is a plan view illustrating a part of the carriage guide and a spring drum with the carriage strap, said view illustrating some of the operating parts of the esoapement in full lines and in dotted lines. Fig. 4 is a longi-' tudinal section on the line 4-4 of Fig. 3.'

Fig. 5 is a cross section on the line 5-5 of Fig. 3, certain of the parts including the pinion being shown in elevation. Fig. 6 is a detail section on the'line 66 of Fig. 5 illustrating the escapernent lever and escapement wheel in raised positions for the purpose of permitting the eseapement wheel to clear the fixed dog'on a. stationary part of the carriage guide, the pinion and certain of the parts being shown in elevation.

designates a typewriterframe, B a type bar. C certain finger levers, and D a/universal bar supporting the universal levers d and universal rod d. These parts may be of the usual or any preferred construction. .\t the rear part of said frame is a plate a. in front of which is an intermediate plate a, and through a slot (1- in this intermediate plate extends the rear part of universal lever (I. The universal bar actuates a bell crank lever E. shown in dotted lines in Fig. 1, said lever being fulcrumed at 6' so that one arm of the lever will extend across universal lever (1, whereby the movement ofriage bed is provided at its respective ends movable with 1 vertical sha with upstanding members {1' which support the cylinder platen G, but obviously the carriage should be equipped with devices usualin the art "for retaining, feeding and guiding the paper. To the under side of the plate forming the carriage bed G is rigidly seeured a bar-H provided with a series of {t eth It, said toothed bar forming a rack which extends longitudinally of the carriage for a suitable part of its length so as to be id carriage. With said rack' H -meshes a. ar Lithe rack and the' gear beilig positioned in the space between the plates forming carriage guide F and carriage bed GQsee Fig.- 2. The gear I is secured rigidl to the upper part of a short the latter being journaled in a suitable i ay in a bearing provided in the plate forming carriage guide F, see Figs. 5 and 6. This shaft is free to rotate in its bearings, but is retained by anysuitable'" Thismeans against endwise movement. lower part 0 the shaft is journaled in a suitable bear ng provided in a bracket K, the latter being positioned below the can riage guide F. and having its respective ends is secured ri idly to said guide F, whereby the part of e bracket intermediate the ends k is spaced with respect to the guide F so as to accommodate the escapement wheel L.

The shaft J is provided intermediate its bearings bracket K and guide F with a square or polygonal part 1', the latter passing loosely through a correspondingly shaped square or polygonal opening in escapement wheel L, whereby the escapementwheel is loosely fitted on the square part of the shaft so that said escapement wheel is free to vibrate or oscillate with respect to the shaft, and, at the same time said escapcment wheel cannot turn idly on the shaft, the result of which is that the escapement-wheel will always turn with the shaft but at the same time is capable of the limited independent sidewisemovement relative thereto. The es? capement wheel is shown in Fig. 3 as having a series of long ratchet-shaped teeth Z,

and in the normal'position of the parts com posing the escapement one tooth l of the Wheel is adapted for engagement with the fixed one of the two dogs employed in the escapement mechanism, said fixed og being indicated at M. The fixed dog is attached to, or forms a part of, brackehJGWhieh depends' from the carriage guide, and when {the carriage is at rest the escapement wheel L is pressed by a spring into a substantially horizontal position so that one tooth Z of said escapement wheel will be in contact with fixed dogM, the latter coi5perating with the escapement wheel and the shaft in restraining the platen carriage from znjvvement under the energy of the carriage sprin As is usual in the art, the carriage spring N,- shown in dotted lines in Fig. 4, is housed or contained within a spring drum 91, around which passes a strap N, said drum n working in a slot 1/ provided incarriage guide F. The carriage strap N extends between the bed and guide of the carriage, as shown in Fig. 4, and at one end this strap is provided with a coupling N by which the strap is attached to the carriage inasfich a manner that the spring will impart movement to. the carriagein one direction but this movement is controlled by the operation the escapement which ivjitprn is control lhd and operated by th itnii ersal ha r associated with the type lever.

Vibratory n'iovement is imparted to the cscapement wheel by the operation of an escapenient lever 0, thelatter being preferably in the form of a bell crank and fulcrumed at its knee to bracket K by a suit- ;lble pin, screw, or other device 0.

Said cscapement lever is arranged for on. arm to occupy a horizontal position alongside of escapement wheel L, and for its other arm to depend from the bracket.- To the depending arm is connected one end of a rod P, the other end of which is connected to the upstanding arm of hell crank E see Fi 1. The connection between rod .l and escapement lever 0 may be effected by any suitable means, but al'rshown, the rod is adapted to passfihosely through an aperture in the depending army of the bell crank 0, said rod having a stop 7) adapted to abut the bell crank. The escapement lcverpccnpies such relation to the escapement wheel that one or more of the long teeth I extend across said escapement lever. v

Q, designates a movable dog which forms a part of, or is attached to, the horizontal arm of the escapement lever. As shown in Fig. 5, the movable dog is in the form of :1 lug extending upwardly from the top edge of; the escapement lever, said dog being in the path of a tooth Z on the (scape'lnent Wheel. N hen movement is imparted to the escapeinent lever by the omeration of hell crank E and the universal lever, said escapeincnt lever is lifted to the position indi-- 'riage and the further movement of the escapement wheel. T he spring 3 acts on the escapement wheel to press it back to normal horizontal position and return the escapeinent lever likewise to its :normal position, at which time another tooth Z on the escapement wheel is brought into engagement with the fixed dog M, thus arresting the movement of the carriage until another key lever is operated. The spring R is shown in Fig. 1 as extending longitudinally within the bracket K, said spring having a bent portion intermediate its ends arranged to contact with the escapement .wheel L.

The operation of the escapement mechanism will be understood from the foregoing description. The carriage is restrained from movement under the energy of the spring by a tooth l of the escapement wheel engaging with the dog M. When a finger lever or the space bar is operated movement is imparted to lever E, rod P and escapement lever O, for the purpose of lifting the eseapement wheel against the elnergv of spring R, which movement of the escapement wheel on the polygonal part of shaft J lifts a tooth of said wheel by the d g M. whereupon the pull of the spring on the carriage turns the gear I and shaft J until the tooth of the escapement wheel comes into abutting engagement with movable dog Q. thus arresting the movement of the carriage. The spring R acts to depress the escapement wheel and the eseapement lever with the result that another tooth on the 'escapement wheel comes into contact with fixed dog M, thereby restoring the parts to normal position for a subsequent operation of the eseapement mechanism.

Having thus fully described the invention, what I claim as new, and desire to secure by Letters Patent is:

1. In a typewriterescapement, the combination of a rotatable wheel, fixed and movable dogs in -otiperative relation thereto, and means for imparting movement to said wheel, said wheel being mounted for vibratory and tiltable movement relative to said fixed dog.

2. In a typewriter escapement, the combination with a platen carriage, of a shaft operatively connected with said platen carriage, an escapement wheel rotatable with said shaft and free to vibrate independently thereof, fixed and movable dogs, and means for il'nparting vibratory movement to said eseapement wheel.

3. In a typewriter escapement, the combination with a platen carriage, of a shaft operatively connected with said platen carriage. said shaft being square for a part of its length. an eseapement wheel fitted on said square part of the shaft for rotation therewith, means for moving the escapement wheel sidewise relative to the shaft, and dogs miperating with said escapement wheel.

4. In a typewriter escapement, the combination with a carriage, and a shaft coopcrating therewith, of an escapement wheel for controlling the rotative movement of said shaft, a fixed dog in the path of said escapement wheel, a movable dog positioned to impart sidewise movement to the escapement wheel and operating to arrest said wheel when it is rotated a predetermined distance, and means for operating said movable dog.

5. In a typewriter escapement, the combination with a cavriage-controlling shaft and a fixed dog, of an-escapement wheel for controlling the otative movement of said shaft,-

and a movable dog operable to shift said escapement wheel so as to disengage said wheel from the fixed dog said movable dog being positioned for engagement with said escapement, wheel when the latter is turned a predetermined distance.

6. In a typewriter escapement, the combination with a carriage-controlling shaft and a fixed dog, of an escapement wheel cooperating with said shaft and normally contacting with said fixed dog, a movable dog, and means for operating the movable dog to shift said escapement wheel to a tilted position relatively to the shaft whereby said escapement wheel is disengaged from the fixed dog and the movable dog is positioned for engagement by said escapement wheel.

7. In a typewriter escapement, the combination with a. shaft, and a fixed dog, of a toothed wheel rotatable with the shaft and tiltable thereon, a movable member for imparting tilting movement to said wheel, and a dog on said movable member in the path of a tooth on said wheel.

8. In a typewriter escapement, the combination with a fixed dog, of a rotatable and tiltable toothed wheel, and an cscapement lever provided with a dog, said lever coiiperating with the wheel to impart tiltable movement thereto.

9. The combination of a polygonal shaft,

a fixed dog; a toothed wheel positioned on the shaft for tiltable movement relative thereto, an escapement lever for imparting tiltable movement to said wheel, and a movable dog.

10. In a typewriter escapement, the combination of a shaft, a toothed wheel loose thereon, a fixed dog, a lever cooperating with said wheel for imparting tiltable movement thereto, a dog movable with said lever, and a spring acting onthe toothed wheel.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE F. ROSE.

Witnesses:

LEWIS J. Bons'r, KATE F. Ross. 

